Introduced in 1973, the design was outwardly based on the M14 rifle and is, in appearance, a scaled-down version chambered in 5.56×45mm NATO, though with its own gas system design.

All BrickArms® Reloaded items are designed and produced by Will Chapman, the founder of BrickArms, in his workshop in Redmond, WA. Using the latest developments in minifigure accessory design and custom tooling, Chapman is able to produce detailed, multi-colored accessories using a multi-step 'overmolding' injection process. The resulting collectors' items are known as BrickArms Reloaded.